Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5845e1ec4c4033…

MALICIOUS

PDF

38.4 KB Created: 2020-03-14 21:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de9ba7bd06a2b0a1360b5e400797cb36 SHA-1: cd7cd5b0f15e5c66f27f155501477d9bc6955ba1 SHA-256: 0d5845e1ec4c4033833aa063ce4fbd2e2920fcbc76adf5e83e042c7efaf5d035
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to PDF files hosted on unrelated domains, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The embedded document body text is obfuscated but contains references to URLs that are likely used to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kinsley-walker-p-1.rominastiebenphotography.com/uploads/1/3/0/5/130588907/130588907.html#string+array+in+kotlin+android
    • http://nastynotfound.com/uploads/1/3/0/2/130289196/1148900.pdf
    • http://advance-it.net/uploads/1/3/0/7/130775688/6847296.pdf
    • http://www.my-adolphus-uil.com/uploads/1/3/0/9/130969356/kaxafamapux.pdf
    • http://www.docsholidayvillageshoppe.com/uploads/1/3/0/5/130539516/jixupokupowivux-sosup-zefaxu.pdf
    • http://maratonadeprogramacao.com/uploads/1/3/0/4/130483232/527461.pdf
    • http://www.katelassiter.com/uploads/1/3/0/9/130969878/7131708.pdf
    • http://sneakersurbanonline.com/uploads/1/3/0/8/130814021/mijibakabev.pdf
    • http://ohiofalconry.com/uploads/1/3/0/6/130640039/5233824.pdf
    • http://deannasgro.ca/uploads/1/3/0/5/130551675/pifuperupel_rolejibi_xexixim.pdf
    • http://stacybx.com/uploads/1/3/0/6/130639024/5602203.pdf
    • http://mysp365.com/uploads/1/3/0/7/130738762/tonudib_pajekapuwu.pdf
    • http://the-birn.com/uploads/1/3/0/4/130489157/nekov_rutisofofizozo.pdf
    • http://katienanasi.com/uploads/1/3/0/6/130605515/94d680.pdf
    • http://kelviron.net/uploads/1/3/0/5/130545733/mozenim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c33.bin
39c33c3a21d161290a93864171268bcb684d0d736971ff92d5309ad9485d8a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C33 8480 bytes

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